[R] mean-plot (add residuals)

[Jörg Groß]

Hi,

I want to plot the mean of a variable and add the standard deviation  
as a line going above and below the mean (like the whiskers in a  
boxplot) but I don't know how to add these residual-lines.

Is there an easy way to do that or do I have to use the line()- 
function to create them on my own?


Thanks for help!